I lived in LA for seven years and I agree about goodwill etc but there still exists an underbelly of scavengers and parasites that live off the naive and hopefull innocents that show up every day to try to be a star.
At some point they need photographs taken and there are hundreds of photographer that live off this type of work. If some are succesfull at getting girls to disrobe they give the girls their pictures and keep the negatives for years, just in case.
In some cases they girls, and also guys, will pose nude just for the money. Unfortunately they will usually later regret it but they made the choice and they now have to live with the consequences.